2122222001221 has 4 divisors (see below), whose sum is σ = 2425396572832. Its totient is φ = 1819047429612.

The previous prime is 2122222001213. The next prime is 2122222001279. The reversal of 2122222001221 is 1221002222212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2122222001221 - 2³ = 2122222001213 is a prime.

It is a super-2 number, since 2×2122222001221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122222001821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151587285795 + ... + 151587285808.

It is an arithmetic number, because the mean of its divisors is an integer number (606349143208).

Almost surely, 2^{2122222001221} is an apocalyptic number.

It is an amenable number.

2122222001221 is a deficient number, since it is larger than the sum of its proper divisors (303174571611).

2122222001221 is an equidigital number, since it uses as much as digits as its factorization.

2122222001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303174571610.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 2122222001221 its reverse (1221002222212), we get a palindrome (3343224223433).

The spelling of 2122222001221 in words is "two trillion, one hundred twenty-two billion, two hundred twenty-two million, one thousand, two hundred twenty-one".